本SAE航空航天推荐规程（ARP）提供了在功能流程示意图和图形计算机化输出上以示意图形式表示航空航天飞行器环境系统部件的符号。这些符号用于提供环境系统基本信息的简化图表。提供的符号表示环境系统中使用的基本类型的组件。提供了基本符号类型的简单变体。原理图上的文字、特殊符号代码或组合基本符号类型的符号（第5节）可在适当时用于扩充基本符号。本文件中未包含的特殊或组合符号应在原理图上定义。 第6节给出了完整示意图的示例。关于环境系统符号的其他文件的参考书目见附录A。

This SAE Aerospace Recommended Practice (ARP) provides symbols to schematically represent aerospace vehicle environmental system components on functional flow schematic drawings and graphical computerized output. The symbols are for use on simplified diagrams that provide basic information about an environmental system.Symbols are provided to represent basic types of components used in environmental systems. Simple variations of basic symbol types are provided. Words on the schematic diagram, special symbol codes, or symbols that combine basic symbol types (Section 5) can be used to augment the basic symbols when appropriate. Special or combined symbols not contained in this document should be defined on the schematic diagram.An example of a complete schematic is given inSection 6.A bibliography of other documents on environmental system symbols is found inAppendix A.